When performing find-all-refs for a keyword, use the first result as the definition.

Author: Andy Hanson

src/services/findAllReferences.ts

@@ -406,20 +406,23 @@ namespace ts.FindAllReferences {
 
     function getAllReferencesForKeyword(sourceFiles: SourceFile[], keywordKind: ts.SyntaxKind, cancellationToken: CancellationToken): ReferencedSymbol[] {
         const name = tokenToString(keywordKind);
+        const references: ReferenceEntry[] = [];
+        for (const sourceFile of sourceFiles) {
+            cancellationToken.throwIfCancellationRequested();
+            addReferencesForKeywordInFile(sourceFile, keywordKind, name, cancellationToken, references);
+        }
+
+        if (!references.length) return undefined;
+
         const definition: ReferencedSymbolDefinitionInfo = {
             containerKind: "",
             containerName: "",
-            fileName: "",
+            fileName: references[0].fileName,
             kind: ScriptElementKind.keyword,
             name,
-            textSpan: createTextSpan(0, 1),
+            textSpan: references[0].textSpan,
             displayParts: [{ text: name, kind: ScriptElementKind.keyword }]
         }
-        const references: ReferenceEntry[] = [];
-        for (const sourceFile of sourceFiles) {
-            cancellationToken.throwIfCancellationRequested();
-            addReferencesForKeywordInFile(sourceFile, keywordKind, name, cancellationToken, references);
-        }
 
         return [{ definition, references }];
     }